When a dream dies it always hurts. Even if you were the one to end a relationship because it was toxic or abusive it's natural to still feel heartache. Grief is something we go through. It's impossible to skip over. Two quotes come to my mind in situations like this.
“Some people think that it’s holding on that makes one strong; sometimes it’s letting go.” — unknown
“I don’t miss him, I miss who I thought he was.” – unknown